This thesis presents the first LHCb measurement of violation in 0 → ∗±∓ decays. Due to the → transition, 0 → ∗±∓ decays give access to higher-order Standard Model contributions. The decay-time-dependent measurement is performed on a dataset corresponding to an integrated luminosity of 9 fb−1 recorded by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The observables are measured with an unbinned maximum likelihood fit as
∗ = −0.861 ± 0.077 (stat) ± 0.019 (syst),
Δ∗ = 0.019 ± 0.075 (stat) ± 0.012 (syst),
∗ = −0.059 ± 0.092 (stat) ± 0.020 (syst),
Δ∗ = −0.031 ± 0.092 (stat) ± 0.016 (syst),
∗ = 0.008 ± 0.014 (stat) ± 0.006 (syst).
To date, the analysis is the most precise single measurement of violation in this decay channel. All parameters are consistent with their current world average values
